Syringe for hypodermic injections.



V. E. MALATO. SYRINGE FOR HYPODERMIC INJECTIONS.

APPLICATION FlLED 0CT.19| 194. 1,181 ,534. Patented May 2, 1916.

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VITTORIO EM. MALATO, OF MILAN,

ITALY.

SYRINGE FOR HYPODERMIC INJECT'IONS.

Application filed October 19, 1914.

To all whom t may concern:

Be it known that I, VITTORIO E. MALATO, doctor of medicine, a subject ofthe King of Italy, and resident of 18 Via Durini, Milan, Italy, haveinvented new and useful Improvements in Syringes for HypodermicInjections, of which the following is a specification.

My invention relates to improvements m syringes for hypodermicinjections.

The said improvements have for their object an automatic andinstantaneous regulation of the pressure inside the syringe, anotherobject is the absolute sterilization and disinfection of the instrument,and further objects are a rational and regular mode of use of thesyringe, and simplicity of construction.

The new means embodied in said improved syringe to attain the abovementioned objects are hereinafter described.

An open tubular piston has at its outer end a cavity for an air-filterAbove said cavity there is a hole, provided on a plano surface andparticularly adapted to enter into a close Contact with the thumb, sothat the latter can be used as an automatic valve. A means is providedto act as a .brake for the piston. This brake has for its object toproduce, while using the syringe, a sufficient reaction on the thumb forthe purpose of maintaining the efficiency of same while acting as aregulatingr valve.

As regards the construction, metallic means are provided for combiningwith one another the parts of the syringe which are preferably made outof glass.

In the annexed drawings are represented, by way of example, threedifferent constructional forms of the syringe.

Figure 1 shows an elevational view partly in section and to a scalelarger than full size, of a syringe of the siphon type, embodying mysaid improvements. Fig. 2 shows a sectional view of a second form ofconstruction of a syringe of the same type as Fig. 1. Fig. 3 shows asectional view, partly in elevation of a simple syringe. Fig. l shows aplane view of some details of construction. FigV 5 is a detailhereinafter referred to.

In the different figures, like numerals designate like parts.

The body or cylinder of the syringe is made of glass 1 and has at itsupper open end a flange 2 and terminates at Specification of Le ersPatent.

Patented May 2, 1916.

Serial No. 867,507.

its lower end in a nozzle 3. A glass-piston lt is open at both ends, andterminates at the top end with a cavity or chamber G for asbestos woolor the like which forms an air-filter 7 This chamber is preferablycomprised between two necks 5 formed in the glass.

8 is a regulating hole for the pressure inside the syringe, and is boredon a surface 9 either plane or slightly convex. To this surface isapplied the thumb for the purpose of acting as an instantaneous valve onthe hole 8 Piston 4 and cylinder 1 are respectively ground outside andinside and they enter and slide airtight one into the other.

The piston brake is made up of one or two springs 10 mounted on asupport. Said support comprises a collar 11 prorided with two arms onwhich rest pieces 12 On the front of pieces 12 are fixed the springs 10which are shaped as seen in Fig. 4. This support device is fitted on thesyringe by a loose collar 11 against the flange Q so forming an eX-tending flange for the flange 2 while springs 10- are arrangedtangentially to piston -4 Underneath flange Q is fitted another collarwith arms 13 and through the arms of the collars 11 13- and the pieces12 are bored in one line, holes 15 for the fixing screws 14 The screwthreads for said screws are formed in the holes 15 1G are centering pinsfor collars 1land 13 17 are regulating thumb-screws, which enter thepieces 12 their heads 18 being set against the free ends of springs 10so as to keep the latter pressed against piston 1 In the forms ofconstruction shown in Figs. 1 and Q the siphon chamber is made up ofcountertube 20- which is fitted around cylinder 1 It is provided with aflange 2 which has the same function as flange Q in Fig. 3.

Tube 3 may constitute a natural tail or nozzle of cylinder 1 or as shownin Fig. 2. It may comprise a separate tube fitted to the short nozzle ofthe cylinder.

Tube 21 is loosely mounted around the nozzle 3 and co-acts with same toform the siphon chamber, while its lower portion is shaped incross-section as not to correspond with its seating in tube 3, so as toleave a free passage for the injection liquid to pass to the nozzle 3,as will be seen at Fig. 5 which is a section through Figs. l and 2 atA-A.

In the siphon-forms, tubes m-3- to receive the holed needle (cannula)are formed at the end of countertube -20-.

While operating the syringe, the thumb is kept constantly at the top ofthe piston and upon the surface -9 above hole 8A- for the purpose ofregulating instantly at will the pressure inside the cylinder.

For the purpose of sterilizing the injection liquid by heat, the hole ofthe needle, may be closed by pinning into it a piece of cork.

Having now particularly described and ascertained the nature of myinvention and in which way the same has to be performed I declare thatwhat I claim is:

l. A syringe for hypodermic injections comprising in combination a glasscylinder open at both ends, an open tubular piston fitted in saidcylinder, a chamber at the top of said piston in direct communicationwith the interior of the piston, a flat surface at the top of saidchamber, air-filtering substance in said chamber, a hole in said flatsurface setting the filter-chamber in communication with the open airand adapted to the application of the thumb for the purpose ofregulating the pressure in the interior of the cylinder.

2. A syringe for hypodermic injections comprising in combination a glasscylinder open at both ends, a flange on one end of the cylinder, an opentubular piston fitted in said cylinder, a chamber at the top of saidpiston in direct communication with the interior of said piston, a flatsurface at the top of said chamber; a hole in said flat surface settingthe filter-chamber in communication with the open air, 4a metalliccollar with side arms resting on the flange of said cylinder, a metalliccollar with side arms resting underneath the flange of said cylinder,two fixing pieces on said first collar, screws connecting said collarsand fixing pieces, flat springs fixed with one end to said fixing piecesand resting with the other end against the piston, adjusting screws insaid fixing pieces and with their heads set against said springs.

3. A syringe for hypodermic injections comprising in combination aglass-cylinder open at both ends and having at the bottom a nozzle, aflange on one end of the cylinder, a cylindrical countertube fittedaround said cylinder, a nozzle at the bottom of the counter-tube to takea cannula, a tubular piece surrounding the nozzle of the first cylinderand mounted inside the countertube so as to form a Siphon-likecommunication between the first and the second mentioned nozzles, anopen tubular piston fitted in said cylinder, a chamber at the top ofsaid piston in direct communication with the interior of said piston, aflat surface at the top of said chamber', a hole in said flat surfacesetting the filter chamber in communication with the open air,air-filtering substance in said chamber, a metallic collar with sidearms resting underneath the flange of said cylinder, a metallic collarwith side arms resting on the flange of said cylinder, two fixing piecesresting on the last named collar-arm, connecting screws of said collarsand said fixing-pieces, flat springs fixed with one end to said fixingpieces and resting against said piston, adjusting screws in said fixingpieces and with their heads set against said springs.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

VITTORIO EM. MALATC.

itnesses GRAN GIUCoNsI GUARiNoN, ARTHUR P. CORDERO.

Copies of this patent may be obtained for ive cents each, by addressingth'e `(lommissioner or Patents, Washington, D. C.

